package com.mzj.saas.captcha;

import cn.hutool.core.codec.Base64;
import cn.hutool.core.util.IdUtil;
import com.google.code.kaptcha.Producer;
import com.haixiaoke.saas.repository.core.AjaxResult;
import com.haixiaoke.saas.repository.exception.BizException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/**
 * 验证码操作处理
 *
 * @author haixiaoke
 */
@RestController
public class CaptchaController {
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    @Qualifier("stringRedisTemplate")
    private StringRedisTemplate redisTemplate;
    /**
     * 验证码 redis key
     */
    public static final String CAPTCHA_CODE_KEY = "captcha_codes:";
    /**
     * 验证码有效期（分钟）
     */
    public static final Integer CAPTCHA_EXPIRATION = 2;

    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public AjaxResult getCode(HttpServletResponse response) throws IOException {
        AjaxResult ajax = AjaxResult.success();

        // 保存验证码信息
        String uuid = IdUtil.simpleUUID();
        String verifyKey = CAPTCHA_CODE_KEY + uuid;

        String capStr = null, code = null;
        BufferedImage image = null;

        // 生成验证码
        String capText = captchaProducerMath.createText();
        capStr = capText.substring(0, capText.lastIndexOf("@"));
        code = capText.substring(capText.lastIndexOf("@") + 1);
        image = captchaProducerMath.createImage(capStr);


        redisTemplate.opsForValue().set(verifyKey, code, CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return AjaxResult.error(e.getMessage());
        }

        ajax.put("uuid", uuid);
        ajax.put("img", Base64.encode(os.toByteArray()));
        return ajax;
    }


    /**
     * 校验验证码
     *
     * @param code 验证码
     * @param uuid 唯一标识
     * @return 结果
     */
    @GetMapping("/captchaValidate/{code}/{uuid}")
    public AjaxResult validateCaptcha(@PathVariable("code") String code, @PathVariable("uuid") String uuid) {
        String verifyKey = CAPTCHA_CODE_KEY + uuid;
        String captcha = redisTemplate.opsForValue().get(verifyKey);

        redisTemplate.delete(verifyKey);
        if (captcha == null) {
            throw new BizException("验证码已过期");
        }
        if (!code.equalsIgnoreCase(captcha)) {
            throw new BizException("验证码有误");
        }
        return AjaxResult.success();
    }
}
